It's unclear whether this is the best square for the queen.
11... a7a5 Gukesh decides to prevent b2-b4. A logical decision, but this creates some weaknesses on the queenside. 12. h2h3  12... c8e6  13. g1h2 A good prophylactic move, reminiscent of Anatoly Karpov. White reinforces the pawn on h3 before it's even attacked. 13... a8b8 A bad decision. This is definitely not the most useful move available.